Business Combinations (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 02, 2017	Sep. 03, 2016	Aug. 29, 2015
Business Acquisition [Line Items]
Goodwill	$ 633,728	$ 624,081	$ 623,626
DECO Tool Supply Co. [Member]
Business Acquisition [Line Items]
Revenue of acquiree	10,369
Loss of acquiree	250
Payments to acquire business	38,000
Real property from affiliates	4,345
Non-recurring transaction and integration costs	1,002
Purchase price	42,345
Acquired intangible assets	12,870
Customer relationships	12,100
Goodwill	$ 8,318
Goodwill amortization period	15 years
Post-closing working capital adjustment paid out	$ 738
DECO Tool Supply Co. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets useful life	10 years